--- ray/src/common/portio.c	2003/07/17 09:21:29	2.8
+++ ray/src/common/portio.c	2016/03/03 22:06:18	2.16
@@ -1,30 +1,31 @@
 #ifndef lint
-static const char	RCSid[] = "$Id: portio.c,v 2.8 2003/07/17 09:21:29 schorsch Exp $";
+static const char	RCSid[] = "$Id: portio.c,v 2.16 2016/03/03 22:06:18 greg Exp $";
 #endif
 /*
  * Portable i/o for binary files
  *
- * External symbols declared in standard.h
+ * External symbols declared in rtio.h
  */
 
 #include "copyright.h"
 
-#include <stdio.h>
-
 #include "rtio.h"
 
-#ifndef frexp
-extern double  frexp();
+#include <math.h>
+
+#ifdef getc_unlocked		/* avoid horrendous overhead of flockfile */
+#undef getc
+#undef putc
+#define getc    getc_unlocked
+#define putc    putc_unlocked
 #endif
-#ifndef ldexp
-extern double  ldexp();
-#endif
 
 
 void
-putstr(s, fp)			/* write null-terminated string to fp */
-register char  *s;
-register FILE  *fp;
+putstr(				/* write null-terminated string to fp */
+	char  *s,
+	FILE  *fp
+)
 {
 	do
 		putc(*s, fp);
@@ -33,10 +34,11 @@ register FILE  *fp;
 
 
 void
-putint(i, siz, fp)		/* write a siz-byte integer to fp */
-long  i;
-register int  siz;
-register FILE  *fp;
+putint(				/* write a siz-byte integer to fp */
+	long  i,
+	int  siz,
+	FILE  *fp
+)
 {
 	while (siz--)
 		putc((int)(i>>(siz<<3) & 0xff), fp);
@@ -44,24 +46,54 @@ register FILE  *fp;
 
 
 void
-putflt(f, fp)			/* put out floating point number */
-double	f;
-FILE  *fp;
+putflt(				/* put out floating point number */
+	double	f,
+	FILE  *fp
+)
 {
+	long  m;
 	int  e;
 
-	putint((long)(frexp(f,&e)*0x7fffffff), 4, fp);
+	m = frexp(f, &e) * 0x7fffffff;
+	if (e > 127) {			/* overflow */
+		m = m > 0 ? (long)0x7fffffff : -(long)0x7fffffff;
+		e = 127;
+	} else if (e < -128) {		/* underflow */
+		m = 0;
+		e = 0;
+	}
+	putint(m, 4, fp);
 	putint((long)e, 1, fp);
 }
 
 
+int
+putbinary(			/* fwrite() replacement for small objects */
+	char *s,
+	int elsiz,
+	int nel,
+	FILE *fp)
+{
+	int	nbytes = elsiz*nel;
+
+	if (nbytes > 512)
+		return(fwrite(s, elsiz, nel, fp));
+	
+	while (nbytes-- > 0)
+		putc(*s++, fp);
+
+	return(nel);
+}
+
+
 char *
-getstr(s, fp)			/* get null-terminated string */
-char  *s;
-register FILE  *fp;
+getstr(				/* get null-terminated string */
+	char  *s,
+	FILE  *fp
+)
 {
-	register char  *cp;
-	register int  c;
+	char  *cp;
+	int  c;
 
 	cp = s;
 	while ((c = getc(fp)) != EOF)
@@ -73,12 +105,13 @@ register FILE  *fp;
 
 
 long
-getint(siz, fp)			/* get a siz-byte integer */
-int  siz;
-register FILE  *fp;
+getint(				/* get a siz-byte integer */
+	int  siz,
+	FILE  *fp
+)
 {
-	register int  c;
-	register long  r;
+	int  c;
+	long  r;
 
 	if ((c = getc(fp)) == EOF)
 		return(EOF);
@@ -94,13 +127,42 @@ register FILE  *fp;
 
 
 double
-getflt(fp)			/* get a floating point number */
-FILE  *fp;
+getflt(				/* get a floating point number */
+	FILE  *fp
+)
 {
 	long	l;
 	double	d;
 
 	l = getint(4, fp);
+	if (l == EOF && feof(fp))	/* EOF? */
+		return((double)EOF);
+	if (l == 0) {
+		getc(fp);		/* exactly zero -- ignore exponent */
+		return(0.0);
+	}
 	d = (l + (l > 0 ? .5 : -.5)) * (1./0x7fffffff);
 	return(ldexp(d, (int)getint(1, fp)));
+}
+
+
+int
+getbinary(			/* fread() replacement for small objects */
+	char *s,
+	int elsiz,
+	int nel,
+	FILE *fp)
+{
+	int	nbytes = elsiz*nel;
+	int	c;
+
+	if (nbytes > 512)
+		return(fread(s, elsiz, nel, fp));
+	
+	while (nbytes-- > 0) {
+		if ((c = getc(fp)) == EOF)
+			return((elsiz*nel - nbytes)/elsiz);
+		*s++ = c;
+	}
+	return(nel);
 }